Speaker cabinet



FIG. 1 is a front isometric view of a speaker cabinet in accordance with the new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof; and,

FIG. 4 is a left side view thereof, the right side, front and back views being identical.

Broken lines in FIGS. 1-3 are included for the purpose of illustrating portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a speaker cabinet, as shown and described. 